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(a) Power-density vs. current density for different types of membranes (b) Methanol permeability (mA) vs. current density (mA/cm2). Symbols: (×) PVA; (○) PVA–PSSA (40% sulfonation); (■) PVA–PSSA (50% sulfonation); (□) PVA–PSSA–mordenite (3 wt %) membrane; (▲) PVA–PSSA–mordenite (5 wt %) membrane; (∆) PVA–PSSA–mordenite (10 wt %) membrane; (■) PVA–PSSA–mordenite (15 wt %) membrane; (●) Nafion-117® membrane. Reproduced with permission from [82]. Copyright Elsevier, 2009.
